Today I am wearing my Debian Developer hat.
Some longstanding Perl warnings in mhonarc have
finally graduated into failure. There is a patch that
appears to fix the problem.
I'm planning to update the Debian package with this fix,
some time over the next few days. No action required
on behalf of MHonArc.
However, MHonArc may want to think about cutting a
2.6.20 release containing this patch. I expect most Linux
distributions to start having this problem over the next year,
if they aren't already.